Internal function values

Why use this example

Use this pattern to explore how Solidity represents typed values and how state-changing expressions affect storage. The entry isolates internal function values so its input, result, and state changes stay easy to compare.

Solidity to run

contract FunctionValues {
  function double(uint256 value) internal pure returns (uint256) {
    return value * 2;
  }
  function transform(uint256 value, function(uint256) pure returns (uint256) operation) internal pure returns (uint256) {
    return operation(value);
  }
  function run() external pure returns (uint256) {
    return transform(21, double);
  }
}

FunctionValues functions = new FunctionValues()
functions.run()

Official Solidity reference

Compare this focused investigation with the complete language definition in the Solidity documentation.

What to expect

The internal double function is passed as a typed value and apply returns 42.

Continue the investigation

Change a value, add another expression, or open Inspect after the run. Accepted entries remain available to the next entry, and the clean replay keeps the complete result reproducible.